Exhaust gases from internal combustion engines are the main source of urban air pollution. Quantification of Polycyclic aromatic hydrocarbons (PAHs) in the exhaust gases is needed for emissions monitoring, enforcement, development, and testing of control technologies. The objective was to develop quantification of gaseous naphthalene in diesel engine exhaust based on diffusion-controlled extrac...

The asymmetric unit of the title compound, C(12)H(8)N(2)·C(10)H(10)N(2)·2H(2)O, contains one half-mol-ecule of phenazine, one half-mol-ecule of naphthalene-1,5-diamine and one water mol-ecule. The phenazine and naphthalene-1,5-diamine mol-ecules are located on inversion centers. The water mol-ecules serve as bridges between the naphthalene-1,5-diamine mol-ecules and also between the naphthalene...

Inhalation of naphthalene causes olfactory epithelial nasal tumors in rats (but not in mice) and benign lung adenomas in mice (but not in rats). The limited available human data have not identified an association between naphthalene exposure and increased respiratory cancer risk. Assessing naphthalene's carcinogenicity in humans, therefore, depends entirely on experimental evidence from rodents...

Excitation spectra of cation and anion radicals of unsaturated hydrocarbons, hexatriene(±), octatetraene(±), cyclopentadiene(+), 1,3-cyclohexadiene(+), and naphthalene(±), were studied by the symmetry adapted cluster-configuration interaction (SAC-CI) method. The calculated results reasonably reproduced the experimental spectra observed by one of the authors (T.S.) and gave reasonable assignmen...

Little information has been contributed to the mechanisms of biological degradation of polycyclic hydrocarbons. The oxidation of naphthalene has received the most attention. Strawinski and Stone (1943, 1954) reported the isolation of substantial amounts of salicylic acid ("most" of the 2.9 mg per ml medium of ether extractable product) from the breakdown of naphthalene by Pseudomonas aeruginosa...

Oil sands process-affected water (OSPW), produced by surface-mining of oil sands in Canada, is alkaline and contains high concentrations of salts, metals, naphthenic acids, and polycyclic aromatic compounds (PAHs). Residual hydrocarbon biodegradation occurs naturally, but little is known about the hydrocarbon-degrading microbial communities present in OSPW. In this study, aerobic oxidation of b...

Little information has been contributed to the mechanisms of biological degradation of polycyclic hydrocarbons. The oxidation of naphthalene has received the most attention. Strawinski and Stone (1943, 1954) reported the isolation of substantial amounts of salicylic acid ("most" of the 2.9 mg per ml medium of ether extractable product) from the breakdown of naphthalene by Pseudomonas aeruginosa...

Oxidation of acenaphthene, acenaphthylene, and fluorene was examined with recombinant strain Pseudomonas aeruginosa PAO1(pRE695) expressing naphthalene dioxygenase genes cloned from plasmid NAH7. Acenaphthene underwent monooxygenation to 1-acenaphthenol with subsequent conversion to 1-acenaphthenone and cis- and trans-acenaphthene-1,2-diols, while acenaphthylene was dioxygenated to give cis-ace...

In the mol-ecule of the title compound, C(30)H(22)N(4)O(2)S(2), the central benzene ring is oriented at dihedral angles of 63.83 (3) and 1.37 (3)° with respect to the naphthalene ring systems, while the two naphthalene ring systems are oriented at a dihedral angle of 62.78 (3)°. Intra-molecular N-H⋯O and N-H⋯N hydrogen bonds result in the formation of one five- and two six-membered rings. The t...

The addition of specific nontoxic inducers of catabolic operons to contaminated sites is an approach that may enhance the efficiency of in situ biodegradation. We determined the genetic response of six pseudomonads to salicylate (also known as 2-hydroxybenzoate) added directly to 50 g of nonsterile soil samples. The strains, isolated from a polyaromatic hydrocarbon-contaminated soil, metabolize...